Clock face



FIG. 1 is a front elevational view of a clock face showing my new design;

FIG. 2 is a front elevational view showing a modified form of my new design;

FIG. 3 is a front elevational view showing another modified form of my new design; and,

FIG. 4 is a front elevational view showing still another modified form of my new design. 

The ornamental design for a clock face, as shown and described. 